Window construction



July 13, 1943. c. B. WEEDON 2,324,447

' wnmow CONSTRUCTION Filedv May 11 1942 s Sheets-Sheet 1 y 13, 1943- c.B. WEEDON 2,324,447 WINDOW CONSTRUCTION v Filed May 11,1942 5Sheets-Sheet 3 C. B.- WEEDON July 13, 1943.

WINDOW CONSTRUCTION Fil ed May 11, 1942 I 1 I I /6 .I I? 65' 5Sheets-Sheet 4 c. B. WEEDON 2,324,447.

July 13, 1943.

' WINDOW CONSTRUCTION Filed May 11, 1942 5 Sheets-Sheet 5 a B f/Ve edonPatented July 13.1943

. UNITED STATES PATENT OFFICE WXNDOW GONS TBUCT ION' Charles B. Weedon,Detroit, Mich. Application May 11, 1942, Serial No. 442,496

7 Claims. This invention relates to improvements in window construction,and pertains more particularly to structures of this type having theadded protection of storm window formations.

The addition of storm window structures to windows to meet theconditions of severe cold weather, has been a practice followed for manyyears, the added structures being of many forms.

has been to provide an auxiliary frame fitting the casement, andarranging, the frame with suitable glass pane -eilecta'with one of thepanes generally hinged to provide for ventilation purposes-the latterbeing opened for a short period and then closed. In such installationsit has been the practice to make the normal window structures ,of theswinging sash type, since such structures offer an easier way in whichto gain accessto the venti-,

lating panel.

The practice of adding storm windows has bercme increasingly prevalentduring the later years due to the development of the metallic windowconstructions, these almost invariably utilizing the swinging sash ideaas the basis for the construction. Composite window structures of thistype are disclosed in the patent granted to me May 14. 1940, -No.2,200,588, and in my. 7 co-pending application filed November 25, 1939,

Serial No. 308,172, these presenting structures which have proven highlysatisfactory under service conditions. These utilize the metalliccasement and window structures, with th windows operating on theswinging sash basis.

-One of the results flowing from such use has been the creation of ademand for the equip-- ment of window easements utilizing sliding sash,

thus making possible the cold weather protection for this type of windowas well as for windows of the swinging type. The source of'the demand ismainly from occupants of buildings not initially prepared for stormwindow installations, thus increasing the difficult es of. the problemsinvolved; where sorm window serviceis contemplated prior to building,the practice has been to utilize windows of the swinging type ratherthan of the sliding sash type. The present invention has been developedto meet these demands.

Applying storm window protection to windows of the slidingsash typeinvolves'a number of problems not present with the swinging sash type,due in part to the difference in operation of the two types. With theswinging sash form the-swinging part of the windowis generally a unitwhich swings into the room, making it possible to connect up a swingablemember of the storm member to move therewith-indicated in the priorinventions above identified; in addition, the structure of the window issuch that it is possible to produce the characteristics of a dead airspace between the two windows, due to the ability to setup specialsealing conditions for the storm window structure.

With windows of the sliding sash type, however, the conditions diil'er.Two sash are generally present with the normal window, these travelingin different and parallel groovesto permit each sash to have itscomplete individual sliding movement; as a result, the storm window canhave no connection for movement with either sash. This is apparent fromthe fact that if the storm window be arranged similar to the normalwindow with corresponding sash connected together, it would not bepossible to give either ment construction would not permit a stormwindow of dual sash slidable in separate grooves (duplicating the normalwindow sash formation), it would be dii'llcult to obtain eilicientclosure against wind-pressures with such formations.

The problems are complicated by thefact that generallyv it is thepractice to remove the storm fwindow structure during the heated seasonsof the year, and where the installations are on upper floors it becomesdinlcult to take down" and "put up" the storm window assemblies. whenthis is coupled with the fact that the storm window additions must bemade with easements not designed to receive additional elements, thedifficulty ofapplying storm windowprotection to sliding sash windowinstallations and obtain efilcient service is readily understood. Thereare additional problems present, and will be referred to hereinafter,butthe above will sufliciently indicate reasons why prior practice hasbeen to Andgenerally limit storm window protection to window structuresof the swinging type.

The'prsent invention is designed to meet the problems presented by theseconditions, and has for its general objects the provision of a stormwindow assembly applicable for service where the normal window formationis of the sliding sash type, and particularly where the installation isto be made for the purpose of converting a normal window constructioninto a stormwindow protected assembly by simply adding to the formerrather than changing structure of the prior installation; in otherwords, removal of theadded assembly will leave the window 'installationsubstantially in its original form.

Several forms of the added assembly. are disclosed herein, each designedto produce efficient service, and to provide the conversion atcomparatively low cost. In producing the result a number of specificfeatures are utilized each of which has its bearing on the general.resultthese will be discussed in detail hereinafter.

To these and other ends, therefore, the nature of which will be moreparticularly set forth as the invention is hereinafter disclosed, saidinvention consists in the improved constructions and combinations ofparts set forth in detail in the following description, illustrated inthe accompanying drawings, and more particularly defined in theaccompanying claims.

In the accompanying drawings, in which simi-' lar reference charactersindicate similar parts in plete. window assembly, the section beingtakenon line 22 of Figure 1, the installation being of one of the forms ofthe invention.

Figure 3 is a sectional view taken on line 33 of Figure 2. s

Figure 4 is a sectional view taken on line 4-4 of Figure 3.

Figure 5 is a detail sectional view taken on line 5-5 of Figure 3.

Figure 6 is a detail sectional view taken on line 6-6 of Figure 5 withthe main unit of the storm window omitted for clearness.

Figure 7 is a detail sectional view taken on line 1-1 of Figure 2.

Figure 8 is a partial section similar to Figure 2 with the storm sashomitted.

Figure 9 is a side edge view of the upper storm sash.

Figure 10 is a detail sectional view taken on line Ill-l0 of Figure 2.

Figure 11 is a perspective view of one of the metallic guides or ways.

Figure 12 is a detail sectional view somewhat similar to Figure 5 butshowing a modified arrangement.

Figure 13 is a detail sectional view on line I i3-l3 of Figure 12 withthe storm sash omitted.

line lB-iB of Figure 15. a

Figure 17 is a detail sectional view showing a metallic sealing stripapplied to the lower storm sash. Y

Figure 18 is an elevational view of the arrangement of Figure 17.

Figure 19 is a detail sectional view showing a further modified form ofsealing strip.

Figure 20 is a sectional view taken on line 20-20 of Figure 19. a

Figure 21 is a vertical view partly in section and partly in elevationshowing a one-piece main unit of the storm window.

The fact that window casements for the sliding-sash type of windowsgenerally have no provision for the addition of externalappliancesexceptin possibly shutters and awnings, both of which aregenerally secured at the outer face of the casement-presents one of thecharacteristics of the problem which must be solved, due to the factthat the storm window must be located within the windowdas'ementand-the.spac eoutside the outer beading strip which defines the outer sideof the channel for the normal outer sash is generally comparativelynarrow. As a result, this condition practically limits the storm windowconstruction to what may be termed a one plane arrangement-the entirewindow must extend practically in a single plane; obviously, therefore,the practice of securing the storm window element to a moving member ofthe normal window, followed in swinging sash practice, cannot beutilized through the use of twin sashes movablein parallel grooves. Inaddition, the narrow space must receive not only the storm window, butmust additionally present the means used to provide the sealing orpartial sealing condition that is requisite with eflicient stormwindows.

The need for setting up the "one-plane" arrangement indicates thepossibility of providing a single window construction for the stormwindow-a result contemplated by the present invention as presentlydescribed-but the fact that such structures would generally need to bepositioned from the outside, while most installations are in buildingsof more than one story, makes it essential that the storm windowassembly should be arranged in such manner as to enable positioning thestructure from inside rather than from outside the house, this conditionforming another characteristic of the problem to be solved. Q

Another characteristic of the problem flows from the fact that it isessential that provision be made for ventilation; .while a storm windowstructure is designed to normally retain a window in practically sealedcondition, it is desirable to ventilate the room at intervals, andprovision must be made to permit the storm window being readily openedfor ventilation purposesa factthat necessitates a structure of stormwindow such as can be opened and closed from within the room, the normalsliding sash permitting ready ventilation through the normal window atwill.

These factors are afew of those which must be met when attempting toapply a storm window assembly to windows of the sliding sash type, thesebeing compulsory. To these should be added the fact that it should bepossible to be able to pass the storm window through the normal windowformation, in order to permit positioning from inside the room. It wouldbe possible to expose the entire normal casement by removal of thesliding sash, but the need for external hinging (preferably at the top)of the storm window tends to reduce the use of the one-piece window toinstallations on the ground floor; on other floors it is preferred toutilize storm windows of the two-member type, and

similar dimensions. v 'ently pointed out, they combinedvvertical lengtharranged in such way as to permit positioning by simply raising thelower normal sash; such arrangement can obviously be ,used onall floors,of the building. i

' In illustrating the invention inits varied forms, I have shown anormal windowcasement A having the sill a, with the usual outer beadingo, inner beading a2, and the, intermediate parting strip at, whichproduce the two parallel channels for receiving the two sashes,indicated .as the upper sash b and lower sash b. As is apparent, thespace between the outer beading a and the outer face of the casementArepreextends throughout this distance and forms a face against which theinner face of both sash c and 0' rest, thus forming part ofthe' sinuouspath referred to. The opposite leg of the way, however, does not extendthe-full distance, but has a zoned from which the metal is omitted, this"zone being preierably in the lower half oirthe way. The lengthof zone11 v is slightly greater than the vertical height ofeither sash, and thelower end of the zone maybe. spaced a short 7 distance from the bottomofthe way; in other sents the space within which the storm windowassembly must be found; this space is generally relatively narrow indepth and thus sets up one of the factors oi the problem to besolved-the provision of an efficient storm window assembly within aspace of small depth characteristic.

This result is obtained in severalways, as now to be described, butinasmuch as a preferred assembly is one that is, applicable to windowsregardless of location and offers the simpler methods of manipulation,the preferred form of the invention is that presented broadly in-Figures2 to 11, wherein two storm sash are utilized and located in the sameplane ,to complete the storm window effect. In' this form the sash is ofwood with the usual pane or, panes, and, for economical production theseare of substantially However, for reasons presoi the two sash is lessthan the length of the vertical length between the upper and lowerinside dimensions of this outer portion of the casement A.

The small permissible dimensions for the assembly are such that itis notpossible to utilize elaborate sealing structures for the storm window,and because of this .the sealing effect is words,,the :outer leg of theway has a zone of sufiicient length such as will permit either sash cand c' to be passed,.as presently described. The

distance between the legs of the way is materially less than the .widthof the sash-see Figure iand 'upper sash member cfis provided with anedge recess 02 at each side to receive this outer leg of the way d. fThe inner face of the bottom of the way is preferably provided with sashc and the upper edge of sash c afie complementally arranged with arabbet joint c2, with the tenon rib of sash 0 located inside. Hence,althoughthere is presented a rabbet Joint effect between the twosash-setting up the sinuous produced by the use of the principles ofsinuous contacting faces-arrangement of opposing faces in such mannerthat any entering air must traverse a sinuous course in moving from theexterior into the space between the normal sashiand the storm sash, andto provide this without materially affecting the configuration of thenormal window structure, since the invention is designed I as anaddition rather than a substitution eifect; hence, the sinuous patheifect is 'set up herein mainly by the relation of added parts to thenormal structure as well as by the relationships set up in the addedparts. [Such arrangement provides for eflicient service, and yet doesnot prevent breathing action'such as might be neededdue to changes ofthe temperature within the space between the windows, For instance, thewindows with a strong sun the air between may have a rise of temperatureand thus cause air expansion; through the ability, to fbreathe"the-higher pressure which would be set up by the expansion is relieved,and no-damage occurs to either of the window structures. In theassemblies of this" form, the parts. are arranged to set up this sinuouseffect. i 1

The two 'sash of the storm wind oware indicated respectively as upperjsash c and :lower sash c-', these'being arranged in vertical alinement.To retain thefsashin position, a metallic -U-shaped way d-shown indetail, in Figure 11,- is secured to the outer facexof 'the outerbeading a at the sides of the casement A. Y i i The overall length ofthe way dis equal to the interior vertical" heightof the casement-theinner 'leg which is the securing leg of the way,

lower portion of'sash c.

path-.the joint is protected against entrance of rain through the jointinto the space between the windows. To ensurea close joint, sash ccarries one or more spring fingers 03 at its lower edge and tin theinner side, the fingers being flared outwardly as indicated, so as tofacilitate propenmatingwhen .being assembled andin service.

As pointed out, thevertical length of each oi.

v sash c and c is less than half the length of the distance between silla and the upper inner face of casement A; hence, the combined verticallength of the two sash does not close the opening of the casement.Since, in practice, it is essential that the upper sash contact theupper wall of the casement, and that the lowersash have a close jointcontactwith the upper sash, it is nec- ,essary to provide for supportingthe lower'sash 'c insuch contacting position; this support is providedby the use of a pair of lengthy tension springs s t-one at each s de ofthe sash one end of the spring being secured to the outer beading a,andthe other end secured tothe adjacent side of the sash, the springbeing located on theinner side of the sash; one end of a spring, at

least, is made readily removable irom its fastening to enable readyassembling and disassembling of the spring mounting. the spring normallybein'g under a desired tension when thejtwo sash areincontact. The upperend of zoned, in practice, is preferably above the line of meetingbetween the two sash, so that the zone extends partially above the Thelower end of the zone d in Figures 2 and 5, is spaced from sill a, butthe arrangement of the lower edge ofsash c is such as to not conflictwith theporti on" ofthis way leg which isretained at the bottom of'theway d. This permits the lower sash c' to swing outward, with the rabbetjoint as a pseudo hinge, for ventilation, springs cl retaining thecontact between the sash. Suitable securing means, illustrated by hooksand eyes 'c! at the bottom of sash c', serve to retain such sash in itsclosed position; when it is desired to swing the sash for ventilation,this connection is broken, the sash swung outwardly, and held in thelatter position by suitable means, the hook and eye structure 08illustrating a convenient means.

To close the space below the sash either of several means maybe-employed. For instance, in Figure 2-and in Figure 5-the lower reachof ways d which includes two legs may receive a stripe which extendsacross the window; this strip may extend above the Tower end of zonesd-in which case the lower edge of sash c' is recessed on its inner sideto receive a portion of the strip, and to complete therewith a sinuouspath below the lower sash 0'. Or, as indicated in Figure 12, specialmetallic pockets I, attached to the beading a, may receive strip e, thusplacing the strip completely inside. of the sash c'in 7 which case thelower edge of the sash is not recessed. While not absolutely essential,I prefer in such case, to provide strip c with a cushioning or sealingelement e', as illustrated in Figure 19;

moved by a reversal of the installation procedure. While removal of thesash during the warm weather may be desirable, it is not essential. Forinstance, one of the features of the present invention includes thesupply of an additional sash similar to who, excepting that the glasspane of the latter is substituted by a wire screen formation-such a sashis indicated at H in Fisure 14. Such screen sash can be substituted forsash 0' during the summer months; and, if desired, a similar substitutef r sash 0 could be provided, thus changing t complete storm-sashset-up" to a screened con'riition for summer service.

As is apparent, the arrangement which places the vertical length of thestorm window as less than the similar internal dimension of the casing,is in contrast with the universal storm window practice, since itleaves'an opening at the bottom of the easement. However, the changedoes not affect the desired result, due to the fact that the strip eserves to close this space while the sinuous the addition of the latterseals the space between the lower sash c' and strip c. Or, as indicatedin Figure 17, the inner face of the lower portion of sash 0' may carry adownwardly projecting plate g, preferably mounted for verticaladjustment, and which, when the window is closed, seats against a ledgein sill a. In the forms of Figures 12, 1'7 and 19, the zone 11' of waysd preferably extends to the lower end of the way, to ensure freedom ofswinging movement of the sash, the latter not being recessed in theseforms.

In practice, it is apparent that after ways d have been installed, theupper sash can be passed out throughgan opened lower sash opening b to aposition outside of the ways, after which the sash is brought inwardthrough zones d into contact with the continuous leg of the ways, beingbelow the upper end of zones 11. at such time.

By then sl ding sash c upward, it passes into proper position withrespect to both legs of the ways, and into engagement with springs d2,the latter retaining this sash in its upper position through frictionalcontact. Sash c' is then passed through the opened lower sash openingsmilar to the practice above described with respect to the upper sashmember 0, and brought into contact with the continuous leg of the ways,and then moved into contact with the lower edge of sash c. Springs 04are then secured in position to sustain the lower sash-and to aid inmaintaining upper sash c in its upper positionafter which the securingmeans 05 is made active.

This firmly seats both sash in position, the upper sash being heldagainst outward movement by the legs of the ways, while the lower sashis held against outward movement by the securing means 05 andthe rabbetjoint with'the upper sash;.inward movement of either sash is preventedby the ways inner legs. Both sash will be retained in their upperpositions by springs cl, with the upper sash assisted by springs d2, aswell as by strip 6 when the form of Figure 2 is being used. When it isdesired to ventilate, means 05 is released, the lower sash swung outwardabout the rabbet joint, and securing means 08 applied. Obviously, thestorm sash can be repath thus set up serves to provide the sealingaction that is desired. Severaladvantages are obtained through thearrangement shown.' For instance, provision must be made forventilation,

and the simplest way of securing this is to permit swinging of all or apart of the storm window the alternative would be to provide a door-inthe storm window itself, thus complicating the storm window'constructionsincethe door would need,

to swing outward due to space restrictions; the swinging action shouldbeon an upper axis in order that the swung window would inclineoutwardly and downwardly to protect against rain or snow; with the loweredge contacting the sill, it is apparent that any accumulation of ice orsnow on the sill outside of the window wouldtend to prevent readyswinging action. In addition, it is possible-especially with the formsof Figures 12 and 19-to provide for minor ventilating eifects by simplyraising strip e (or adjusting this strip in Figure 17) to a desiredextent without opening the swinging sash. Again, raising of the strip ewould permit any moisture-due to the entrance of rain or snow while thestorm window were swung to an open position-to readily drain out overthe sill a. I

As indicated in Figures 15 and 16, the storm window arrangement need notnecessarily be of the wood sash type, these views indicating the sash cand c' as beingof metal frame type, in place of the wood frame type ofthe remaining disclosure. Since this permits of a narrower width of sashwithout loss of strength, the ways d used with this form have thedistance between Y legs sufficient to receive the complete sash width.

The ways would include the zone d, with the latter continued to thelower end of the way. Since the rabbet formation of the meeting faces ofthe two sash-present with the wood formis not convenient in the metallicform, a similar effect is produced by providing a'downwardlyprojectingplate formation clli at the lower edge zone of the upper sash c andlocated on the outer side of the sash, as indicated in Figure 15; theplate condition eflect may be produced in any desired way. The lowersash c is supported in similar manner to that of the wood form, andstrip e is inside of the lower edge of the lower sash and arranged as ineither of the forms of Figures 12 and 19. I

As indicated in Figure 21, the storm window It may be of the one elementtype, in which case it is hinged at its upper edge to the casement A.

The way d in this form omits theouter leg, since the outward swingingmovement is of the entire -wlndow. As in the remaining forms, the lowerSince the window is supported from its hinges,

springs cl are omitted, the securing means cl serving to retain thelower end of the window in position. While this form operates emciently,

the need for the hinge mounting on the outside practically necessitatessecuring in position from the exterior when being installed or removed,

, and for this reason this particular form is more particularly adaptedfor installation on windows readily accessible from the exterior.

As is apparent the protection effect is produced;

by what may be termed the "main unit"which may be the two sash c and c"or the one member shown in Figure 2land the closure strip e in either ofits types or the plate a. In such assembly the portion protected by thestrip e or plate a is but a relatively small percentage of the totalheight of the space to be protected, so that the two-member or the onemember elements pro vide the main portion of the protection; since thevertical length of the main portion remains similar whether of one ortwo member formation, such main portion may be considered as the mainunit of the assembly and is to be given this meaning in the presentdescription. v i

As is apparent, each of the forms shown as up the condition of a stormwindow formation capable of ready installation within the limitations ofthe narrow width of casement. that. is

found external of the outer beading of sliding sash windows, and whichwill present the sinuouspath type of sealing to produce eiiicient winterservice conditions. provides for ventilating possibilities in a simplemanner. Each of the forms presents a simplified structure such as can beprovided at low cost-a factor especially valuable where the installationis tobe made on windows of older houses, where heavy outlays for largenumbers of windows may not appear warranted. I

As shown in the drawings, each of the forms shown involves the spacingof the lower edge of the storm window member or members from the silla'of the casement, together with the use of strip arrangement e as ameans for substantially closing the opening thus provided; and in thebut present the in... mummy of producing a spongy and water soakedcondition within such relation with the sillas well as a drainage chaneIn each form the assembly above description someof the advantages due tothe presence of the strip arrangement have been emphasized as a part ofthe disclosure oi the structures employed. However, certain additionaladvantages are present for this arrangement and which are made manifestthrough comparative consideration with a structure or.

structures which do not utilize this idea.

For instance, with the storm window assembly extending the full heightof the window. the lower rail of the lower sash 0 would need to contactwith the sill: with the lower sash used for ventilation. it would benecessary to swing such lower rail, and the need for this could make itdimcult to obtain a good closure effect. with the sill. But the greaterdifficulty would result from the fact that .not only would there be atendency to set up swelling of'the lower zone of this sash, especiallyin inclement weather with the sill carrying snow or rain, but the factthat trapped moisture inside of the storm window (as when the latter isopened for ventilation) would not only tend to provide such swellingeiiect,

nel. While moisture trapping is possible with the present arrangement,the ability to raise, strip e enables ready drainage; and even in theevent of the trapped moisture affecting the strip itself, deteriorationof the latter such as to require replacement would be the renewal of thesmall strip formation-inexpensive as compared with the cost of replacinga lower sash member in its entirety.

While I have illustrated and described various structural arrangementsfor carrying out the fundamental obiects'of the invention, it will bereadily understood that changes and modifications therein may be founddesirable or essential in meeting the various exigencies of installationand service, or the individual desires of users, and I reserve the rightto make any and all such changes and modifications as may be found de--sirable or essential, insofar as the same may fall 'within the spiritand scope of the invention as expressed in the accompanying claims, whenbroadly construed.

I claim:

l. The combination with a window construction of the sliding sash type,wherein the construction includes a casement having a sill and the usualouter and inner beading together with the parting strips to provide theparallel channel formations for the sliding sash, of means for applyingstorm window protection for such window construction, said meanscomprising a main unit/composed of a pair of vertically alined membersand mounted within the casement, said members having an overall verticaldimension less than the distance between'the casement sill and the upperinner face of the easement and located outside of and in proximity tothe outer face of the outer beading when in storm protection positionwith the top of the upper member substantially in contact with suchupper inner face of the casement to thereby position the lower zone ofthe lower member of the unit as spaced from thecasement sill, said unitmembers having their'opposed meeting edges of complemental rabbetformation wherein the inner zone of the lower member edge is of malecharacteristic to the similar zone of the lower edge 'of the uppermember, means for supporting. the memface of the lower edge zone of thelower member of the unit to complete the protection closure of theeasement interior with the closure external of the sliding sash.

2. A combination as in claim 1 characterized in that the closure stripis mounted with its inner face substantially in the vertical plane oftheinner faces of the unit members, with the inner zone of thelower edgeportion of the' lower member of the unit recessed to receive stripportions. 8. a means for applying-storm protection to windowconstruction of the sliding sash type, wherein the window constructionincludes the usual casement with its sill and having the outer and innerbeading with the interposed parting strip to provide the parallelchannels for the sliding sash, a protection assemblage comprising a pairof metallic U-shaped ways secured respectively to the outer face of theouter beading at opposite sides of the casement, and with the bottom ofeach way in proximity to the casement side, the inner leg of each wayhaving a length equal to the vertical distance between the sill and theupper inner face of the casement and having its outer leg length such asto provide an open zone for the ways, a removable upper member having athickness greater than the distance between the legs of the U-shapedways and having its side edges grooved intermediate the member sidefaces to receive the cuter legs of the ways and insertible through suchopen zone and be slidable to upper position relative to said ways, aremovable lower member of substantially similar thickness to the .uppermember also insertible through such open space and positionable insimilar relation to the outer leg of the U-shaped means and with itsupper edge in contact with the lower edge of the upper member with suchmeeting faces complementally presenting a rabbet configuration in whichthe male portion of the lower member is located at the inner side of thevertically alined members, the overall length of the positioned membersbeing less than the vertical distance between the sill and the upperinner face of the casement to thereby provide a space between thesillrand the lower edge of the lower member, means for supporting thetwo members in'such position, and a closure strip of greater verticaldimension than the vertical distance of'such latter space with the stripmounted for vertical adjustability relative to the sill, said closurestrip being mounted to co-operate with the sill and the lower edge zoneof thelower member to complete the protection closure of the casementwith the closure external of the sliding sash.

4. An assembly as in claim 3 characterized in that the upper limits ofthe open zones of the outer legs of the ways is positioned above themeeting line of the members with such open zones having a length tothereby permit bodily swinging of the lower member outward at will abouta horizontal axis provided by the rabbet configuration and with thelower edge zone of the member having the greater range of swingingmovement.

5. An assembly as in claim 3 characterized in that the lower limit ofthe open zone of the ways 'is' spaced from the sill to thereby presentan end zone of the ways as a means for positioning the closure strip.

6. An assembly as in claim 3 characterized in that the supporting meansfor the members includes tensioning springs having their upper endscarried by the outer beading and their lower CHARLES E. WEEDON.

